Android - 防止 WebView 在旋转时重新加载 [英] Android - Preventing WebView reload on Rotate

问题描述

当我旋转屏幕时，WebView 会重新加载整个页面.我不能有这个，因为我的一些内容包含动态/随机材料.当前，当旋转屏幕时，会从 loadUrl() 方法重新加载原始 URL.

When I rotate my screen, the WebView reloads the whole page. I can't have this since some of my content contains dynamic/random material. Currently when rotated the screen reloads the original URL from the loadUrl() method.

知道我的代码有什么问题吗?

Any idea what's wrong with my code?

MainActivity.java

package com.mark.myapp;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.KeyEvent;
import android.view.Menu;
import android.webkit.WebView;
import android.webkit.WebViewClient;

public class MainActivity extends Activity {

    WebView web;
    String webURL = "http://www.google.co.uk/";

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        if (savedInstanceState != null)
            ((WebView)findViewById(R.id.web)).restoreState(savedInstanceState);

        web = (WebView) findViewById(R.id.web);
        web.getSettings().setJavaScriptEnabled(true);
        web.loadUrl(webURL);
        web.setPadding(0, 0, 0, 0);
        web.getSettings().setLoadWithOverviewMode(true);
        web.getSettings().setUseWideViewPort(true);
        web.getSettings().setSupportZoom(true);
        web.getSettings().setBuiltInZoomControls(true);

        web.setWebViewClient(new HelloWebViewClient());
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }

    private class HelloWebViewClient extends WebViewClient {
        public boolean shouldOverrideUrlLoading(WebView web, String url) {
            web.loadUrl(url);
            return true;
        }
    }

    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if ((keyCode == KeyEvent.KEYCODE_BACK) && web.canGoBack()) {
            web.goBack();
            return true;
        }
        return super.onKeyDown(keyCode, event);
    }

}

AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.mark.myapp"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="15" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"

            android:configChanges="orientation|keyboardHidden">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
    <uses-permission android:name="android.permission.INTERNET"/>
</manifest>

推荐答案

我觉得主要问题是你调用 web.loadUrl(webURL);也是当 savedInstanceState != null

I think the main problem is that you call web.loadUrl(webURL); also when savedInstanceState != null

编辑

试试:

if (savedInstanceState == null)
{
  web.loadUrl(webURL);
}

EDIT2:您还需要覆盖 onSaveInstanceState 和 onRestoreInstanceState.

EDIT2: You also need the onSaveInstanceState and onRestoreInstanceState override.

@Override
protected void onSaveInstanceState(Bundle outState )
{
super.onSaveInstanceState(outState);
web.saveState(outState);
}

@Override
protected void onRestoreInstanceState(Bundle savedInstanceState)
{
super.onRestoreInstanceState(savedInstanceState);
web.restoreState(savedInstanceState);
}

注意:还请在您的 Activity 中添加您的 AndroidManifest.xmlandroid:configChanges="方向|屏幕尺寸"谢谢

Note: Please also add in your AndroidManifest.xml in your Activity android:configChanges="orientation|screenSize" Thanks

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